Add Yahoo as a preferred source to see more of our stories on Google. Alexei Navalny's widow Yulia Navalnaya says European analysis of his blood proves that the Russian opposition leader was murdered ...

Five European countries say tests confirm late Russian opposition leader Alexei Navalny was poisoned with a lethal toxin found in poison frogs, and they blame the Kremlin.

There is no innocent explanation for the presence of the toxin detected after Navalny's death, which is from frogs in South America and is not naturally found in Russia, European allies say.